The plumber who refused to take payment from elderly and disabled customers said he is aiming to raise enough money to help 1,000 families this winter.

The good deed of James Anderson, 52, from Burnley, England, went viral in September after an image of the invoice he charged a 91-year-old woman with acute leukemia zero pounds posted online. 

“No charge for this lady under any circumstances,” the invoice reads. “We will be available 24 hours to help her and keep her as comfortable as possible.”

Anderson runs a nonprofit company that works with a network of plumbers and heating engineers to provide work for customers unable to afford it themselves. Since September, he said he receives around 15 calls a day.

This week, after receiving a call from a pensioner’s care giver, Anderson is now asking for help from the public to raise £30,000 (US$39,404) via a GoFundMe appeal, which he said will mean he can help another 1,000 families over the winter.

“A company wanted £3,000 upfront payment before they’d even go out and look at the boiler. This woman’s 74, walking around the house in a hat, gloves, scarf—she’s on a pension, she hasn’t got that kind of money,” he told Press Association. “So we’re raising extra funds so we can help up to an extra 1,000 household through this winter because it’s just getting worse.”

Anderson said he encouraged more plumbers and heating engineers who want to help out to get in touch—they need to provide their labor free of charge, but Depher pays for parts and offers £30 (approximately US$39.41) expenses per job.

“The more people that come on board, the better it’s going to be for us as a trade because we need to get rid of this stigma that a lot of people think that plumbers and heating engineers charge too much and they only do this so they can get the money,” he said.